Java MethodVisitor.visitLdcInsn方法代码示例

import org.springframework.asm.MethodVisitor; //导入方法依赖的package包/类
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// pseudo: if (leftOperandValue) { result=true; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFEQ, elseTarget);
	mv.visitLdcInsn(1); // TRUE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

import org.springframework.asm.MethodVisitor; //导入方法依赖的package包/类
@Override
public void generateCode(String propertyName, MethodVisitor mv,CodeFlow cf) {
	if (method == null) {
		try {
			method = Payload2.class.getDeclaredMethod("getField", String.class);
		}
		catch (Exception e) {
		}
	}
	String descriptor = cf.lastDescriptor();
	String memberDeclaringClassSlashedDescriptor = method.getDeclaringClass().getName().replace('.','/');
	if (descriptor == null) {
		cf.loadTarget(mv);
	}
	if (descriptor == null || !memberDeclaringClassSlashedDescriptor.equals(descriptor.substring(1))) {
		mv.visitTypeInsn(CHECKCAST, memberDeclaringClassSlashedDescriptor);
	}
	mv.visitLdcInsn(propertyName);
	mv.visitMethodInsn(INVOKEVIRTUAL, memberDeclaringClassSlashedDescriptor, method.getName(),CodeFlow.createSignatureDescriptor(method),false);
}
 

import org.springframework.asm.MethodVisitor; //导入方法依赖的package包/类
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// Pseudo: if (!leftOperandValue) { result=false; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFNE, elseTarget);
	mv.visitLdcInsn(0); // FALSE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

import org.springframework.asm.MethodVisitor; //导入方法依赖的package包/类
@Override
public void generateCode(String propertyName, MethodVisitor mv, CodeFlow cf) {
	String descriptor = cf.lastDescriptor();
	if (descriptor == null || !descriptor.equals("Ljava/util/Map")) {
		if (descriptor == null) {
			cf.loadTarget(mv);
		}
		CodeFlow.insertCheckCast(mv, "Ljava/util/Map");
	}
	mv.visitLdcInsn(propertyName);
	mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "get","(Ljava/lang/Object;)Ljava/lang/Object;",true);
}
 

import org.springframework.asm.MethodVisitor; //导入方法依赖的package包/类
/**
 * Create the optimal instruction for loading a number on the stack.
 * @param mv where to insert the bytecode
 * @param value the value to be loaded
 */
public static void insertOptimalLoad(MethodVisitor mv, int value) {
	if (value < 6) {
		mv.visitInsn(ICONST_0+value);
	}
	else if (value < Byte.MAX_VALUE) {
		mv.visitIntInsn(BIPUSH, value);
	}
	else if (value < Short.MAX_VALUE) {
		mv.visitIntInsn(SIPUSH, value);
	}
	else {
		mv.visitLdcInsn(value);
	}
}
 

import org.springframework.asm.MethodVisitor; //导入方法依赖的package包/类
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	int intValue = (Integer) this.value.getValue();
	if (intValue == -1) {
		// Not sure we can get here because -1 is OpMinus
		mv.visitInsn(ICONST_M1);
	}
	else if (intValue >= 0 && intValue < 6) {
		mv.visitInsn(ICONST_0 + intValue);
	}
	else {
		mv.visitLdcInsn(intValue);
	}
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

import org.springframework.asm.MethodVisitor; //导入方法依赖的package包/类
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// TODO Future optimization - if followed by a static method call, skip generating code here
	if (this.type.isPrimitive()) {
		if (this.type == Integer.TYPE) {
			mv.visitFieldInsn(GETSTATIC, "java/lang/Integer", "TYPE", "Ljava/lang/Class;");
		}
		else if (this.type == Boolean.TYPE) {
			mv.visitFieldInsn(GETSTATIC, "java/lang/Boolean", "TYPE", "Ljava/lang/Class;");
		}
		else if (this.type == Byte.TYPE) {
			mv.visitFieldInsn(GETSTATIC, "java/lang/Byte", "TYPE", "Ljava/lang/Class;");
		}
		else if (this.type == Short.TYPE) {
			mv.visitFieldInsn(GETSTATIC, "java/lang/Short", "TYPE", "Ljava/lang/Class;");
		}
		else if (this.type == Double.TYPE) {
			mv.visitFieldInsn(GETSTATIC, "java/lang/Double", "TYPE", "Ljava/lang/Class;");
		}
		else if (this.type == Character.TYPE) {
			mv.visitFieldInsn(GETSTATIC, "java/lang/Character", "TYPE", "Ljava/lang/Class;");
		}
		else if (this.type == Float.TYPE) {
			mv.visitFieldInsn(GETSTATIC, "java/lang/Float", "TYPE", "Ljava/lang/Class;");
		}
		else if (this.type == Long.TYPE) {
			mv.visitFieldInsn(GETSTATIC, "java/lang/Long", "TYPE", "Ljava/lang/Class;");
		}
		else if (this.type == Boolean.TYPE) {
			mv.visitFieldInsn(GETSTATIC, "java/lang/Boolean", "TYPE", "Ljava/lang/Class;");
        }
	}
	else {
		mv.visitLdcInsn(Type.getType(this.type));
	}
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

import org.springframework.asm.MethodVisitor; //导入方法依赖的package包/类
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	if (this.value == BooleanTypedValue.TRUE) {
		mv.visitLdcInsn(1);		
	}
	else {
		mv.visitLdcInsn(0);
	}
	cf.pushDescriptor(this.exitTypeDescriptor);
}
 

import org.springframework.asm.MethodVisitor; //导入方法依赖的package包/类
@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	mv.visitLdcInsn(this.value.getValue());
	cf.pushDescriptor(this.exitTypeDescriptor);
}